Safety device for elevators, conveyers, and like apparatus



A. TEICHMANN SAFETY DEVICE FOR ELEVATORS, CONVEYERS, AND LIKE APPARATUS Filed Dec. 16, 1925 33 INVENTOR:

Patented Oct. 18, 1927.

UNITED: STAT PATEN T OFFICE.

, ALBERT TEICHMANN, F ZEI' IZ, GERMANY;

Application filed December 16, 1925, Serial No. 75,783, and in Germa'ny September so, 1925.

The invention relates to safety devices for elevators, conveyers and like apparatus'and is an improvement in or modification of. the invention described in my prior specification Ser. No. 9,628 of February 16, 1925 The present invention-provides, below the upper band-pulley described in the parent patent specification, an auxiliary device which is organically associated with the coupling and by means of which the drive may be suddenly put out of action on any floor of a building, even on the ground floor and top floor, by pulling a rope by hand. That such sudden throwing out of action of the drive should be possible in. addition to the automatic disengagement above referred to is highly desirable when for other reasons than that of slipping or stoppage of the band there is danger of an accident, as, for instance, should stoppages of calenders (lValzenstiihlen), mill courses, exhausters and so on have occured whereby sparks or foreignsubstances might readily pass into the elevator.

An embodiment of the invention is shown by Way of example, in the accompanying drawing, in which Figs'l and 2 are front elevation and section, respectively, of the pulley device of Figs. 1 and 2 of the parent patent specification in combination with the device for disengaging the coupling by hand. The pulley is here shown turned through about 180 from its position showninFigs. 1 and 2 of the cited specification.

Referring to the drawings, the shaft 1 is journalled as usual in the head of the elevator and is rotated bya belt or the like from a pulley not shown. On the shaftl shown a sleeve 2 is held by screws and provided at both ends with flanges 3, on which sleeve the hub i of the pulley 5 may run freely. In order to mount the hub 4 on the sleeve, the latter. is split in the middle. The bandpu'lley 5, or so-called head-pulley in contradistinction to the pulley (not shown) at the. foot of the elevator, has a central wall 6 into which are rigidly inserted the several pins of the disengaging device.

The endless band 7 carrying the buckets or other lifting receptacles 8 is stretched over the pulleys at the top and bottom of the elevator and is provided with lugs 9 serving as abutment members and spaced at certain distances from one another, which lugs form the ends of a narrow plate 10 secured transversely to the band. With this arrangement the plate 10 maybe located between a bucket 8 and the band 7 and be screwed to these parts, as may be' seen from Figs; 1 and 2.

The abutment I members may however be mounted on theband 7 independently of thebuckets and have a form dillering from that shown in the drawings so long as they fulfill the end 1n view. r

In the flange 3 of the sleeve 2 is provided a groove 11 into which a tooth 12 of an L-lever pivoted on the pin 13 engages. The arm 14 is connected to a retracting spring 16 and the arm is located below a lever 17, the pivotal pin 18 of which, like thepin' tageous to duplicate'the abutment'members, L-levers and all apertaining elements and to arrange them at equal distances from the middle wall 6. y i y The ends of the lever 23 andlugs 9' are wedge-shaped.

The operation of the device is as follows:- I 1 i If during normal operation the band 7 and pulley 5 run at equal speeds the abutment members on the band and the tappet end of the lever 23do not engage one another: even Should the band 7 slip slightly,"disengagement of the coupling is not possible because should the band slip only slightly on the pulley 5 the lever 23 will yield somewhat The band-pulley 5 is conveniently bal- I anced by means of. a mass 24. It is advanwhen it engages the lugs 9, but before disengagement of the coupling takes place the lug '9 will, if the slipping is slight enough, pass downwards out of engagement with the lever 23 which will then returnto its normal position. On the other hand, the effect is different should the band remain stationary 1 I as the result of blockage in the elevator or for some other reason. In this case the abutment member 9 coming at the moment into consideration engages against the'lever 23, so offering a positive resistance, and since the lever is driven by the pulley 5 which continues to turn in thedirection shown by the arrow, the said lever is turned on the pin 22 into the position shown by. dotted lines. Hereby it displaces the, thrust bar 20 and the position II shown dot-ted in Fig. 1.

latter the lever 17. This lever 17 depresses the arm 15 of the L-lever and the arm 14 of the latter moves the tooth 12 from the groove the opposite edges of the pulley the band is continually guided on the pulley by said members, whereby laterally slipping of the band and likewise the danger of fire resulting therefrom are avoided.

Figs. 1 and 2 show, arranged inthe vicinity of the band pulley 5 and vertically below the shaft 1, a shaft 27 which is journalled in plates 27?, 27* secured to the casing I of the elevator; this shaft 27 carries two cam levers 27 designed to coact with the tappet-levers 23 and in addition carries on its central portion, that is, conveniently in. the plane of themiddle wall 6, a latchlever 28.

At one end or at each end of the shaft 27 is mounted a lever 29 (the mounting at each end not being shown) to the free end of T which lever is secured a rope 29 This rope asses through all the floors down to the bottom one so that it can be pulled at any required place. Secured to the lever 29 near its axle is a steel plate 30 which slides against a second steel plate 31 firmly screwed on to the plate 27?. A slanting circular hole 32 is bored through the two steel plates through which hole a wire 33 is passed. The loop of wire 33 is drawn together by means of a lead-seal 33 and this firmly holds the lever 29 in its normal position (shown in Fig. 1 by the full lines).

If there is danger of an accident, for the reasons given in the introduction, in the room wherein this is observed a strong pull is given to the rope 29 The steel plates 30, 31act in the manner of shears and sever the leaded wire 33, in consequence of which the lever 29 descends, aided by gravity, to qtlle 7 result of this movement is that the cam-lever 27 engages the'tappet-lever 23 on the pulley 25 and the tooth-coupling is disengaged in the same way as it was by means of the lugs 9, 'as explainedwith reference to Figs. 14 of the parent patent specification.

The latch-lever 28 serves first of all to limit the downward stroke of the lever 29. As soon as the latch-lever 28 abuts against the external periphery of the band-pulley (position II Fig. 1) the lever 29 is arrested in its downward movement. There is provided on the disc 5, however, a grooved recess'34 preferably located in the plane of the middle Wall 34, which recess serves the following purpose. lVhen the coupling is disengaged in the manner described, it may happen that the elevator with its fully charged buckets 8 will run backwards. This backward movement however can last only a few seconds because, as soon as the recess 34, approaches the latch 28, the nose of the latter engages in said recess 34 (position III shown in dotted lines in Fig. 1) and consequently acts like a detent in preventing the pulley 5 from turning back any further.

The latch 28 and recess 34 however in no circumstances prevent forward rotationof the pulley 5. a

This device for disengaging the cou ling by hand may without difiicultybe com ined with the modification accordin to Figs. 3

a and 4 of the parent patent specification.

1. A safety device for elevators and power transmission belting, comprisin in combination with the driving shaft, a band pulley I loosely mounted on saidsha-ft, a band gui ed over said pulley, abutment members on said band and projecting over the rim of said pulley, a coupling mounted inside said band pulley and connecting said pulley with said shaft, means in said pulley projecting into the path of said abutment members and designed to be operated by the latter when the band stops to disen age said coupling, and an auxiliary device or disengaging said coupling, said auxiliary device extending alongsic e the elevator. or power transmission belting, whereby said auxiliary device may be operated and the drive for the elevator or power transmission belting put out of ac tion at any desired point of the latter.

2. A safety device according to claim 1,

wherein the auxiliary device for disengaging the coupling consists of the following instrumentalities: a shaft journalled at a fixed point of the elevator and below the band pulley, cam levers mounted on said shaft, a disengaging lever fast on said shaft, tappet levers associated with the coupling,

and a rope passing alongside the elevator or power transmission belting and adapted to act upon said disengaging leverwhen said rope is pulled so that said disengaging lever co-acts with said shaft, said cam levers and said tappet levers disengaging the coupling in order to effect a sudden disengagement of the latter independently of its automatic disengagement. I

3. A safety device according to, claim 1, wherein the auxiliary device for disengaging the coupling consists of the following instrumentalities: a shaft 'journalled at a fixed point of the elevator and below the band pulley, cam levers mounted on said shaft, a disengaging lever fast on said shaft,

' tappet levers associated with the coupling,

a rope passing alongside the elevator or power transmission belting and adapted to act upon said disengaging lever when said rope is pulled so that said disengaging lever co-acts with said shaft, said cam levers and said tappet levers disengaging the coupling in order to effect a sudden disengagement of the latter independently of its automatic disengagement, and a latch lever fixed on said shaft and adapted to engage the periphery of said band pulley for preventing a backward rotation of the latter and for 15- limiting the downward movement of said disengaging lever.

In testimony whereof I aflix my signature.

'ALBERT TEIGHMANN. 

